Light to 60th
Oldguy - I hear you... and I have the same experience. That hill after the light on 47th is short and a quick sprint gets you up it BUT...
There's a deceptive and uphill grade all the way to 60th so it's tough to get any momentum. I find that after the sprint it's all I can do keep her over 10 mph especially at the end of the week. You get any kind of wind and it seems exponential in difficulty.
For me I think my aging legs just can't recover quick enough and there's just enough resistance to prevent a rebound.
Cross 60th and suddenly it feels better. Oh crud, now Tabor.